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      "body": "Congratulations @ajose01! You have completed the following achievement on the Hive blockchain and have been rewarded with new badge(s) :\n\n<table><tr><td><img src=\"https://images.hive.blog/60x70/http://hivebuzz.me/@ajose01/replies.png?202101081555\"></td><td>You got more than 10 replies. Your next target is to reach 50 replies.</td></tr>\n</table>\n\n<sub>_You can view your badges on [your board](https://hivebuzz.me/@ajose01) and compare yourself to others in the [Ranking](https://hivebuzz.me/ranking)_</sub>\n<sub>_If you no longer want to receive notifications, reply to this comment with the word_ `STOP`</sub>\n\n\n\n**Do not miss the last post from @hivebuzz:**\n<table><tr><td><a href=\"/hivebuzz/@hivebuzz/pud-202101-feedback\"><img src=\"https://images.hive.blog/64x128/https://i.imgur.com/xQGM37X.png\"></a></td><td><a href=\"/hivebuzz/@hivebuzz/pud-202101-feedback\">Feedback from the January 1st Hive Power Up Day</a></td></tr></table>",
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      "body": "Congratulations @ajose01! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@ajose01/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@ajose01) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=ajose01)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/7CiQEO.png\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\">SteemitBoard - Witness Update</a></td></tr><tr><td><a href=\"https://steemit.com/steemmeetupaachen/@steemitboard/steemitboard-to-support-the-german-speaking-community-meetups\"><img src=\"https://steemitimages.com/64x128/https://cdn.steemitimages.com/DQmeoNp9iCaCfd2D6TqnWa3Aky2mU4Fm3xaSmjTM91YoNBS/image.png\"></a></td><td><a href=\"https://steemit.com/steemmeetupaachen/@steemitboard/steemitboard-to-support-the-german-speaking-community-meetups\">SteemitBoard to support the german speaking community meetups</a></td></tr></table>\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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{
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    {
      "body": "# EOS Signature Verification and ECDSA Tooling with Elixir\n\n![kelly-sikkema-1485308-unsplash.jpg](https://cdn.steemitimages.com/DQmX3cUD6T2ZEQDfPLzFVBf9hbMr8EvWoMTGjKRzFbPvFwX/kelly-sikkema-1485308-unsplash.jpg)\nPhoto by Kelly Sikkema on Unsplash\n\n\nElixir is one of my favorite programming languages. It's a wonderful backend languages and it really lends itself to glueing many of the backend processes that support synchronizing blockchain world to current infrastructures. A recent task I worked on requires verifying using an EOS signature to prove a request on our services. After plenty google-fu and reading through the [eosjs-ecc](https://github.com/EOSIO/eosjs-ecc) library here's what I came up with:\n\nFirst, to simplify things for the elixir side we'll grab the EOS signature in hex format vs. the standard `SIG_K1_` format. Doing so isn't too difficult with `eosjs-ecc`:\n```\nconst sig = ecc.Signature.sign('helloworld', privateKey).toHex();\n// or if you already have a signature\nconst sig = ecc.Signature.fromString('SIG_K1_....');\nsig.toHex();\n//sample hex:\n//'1f529f1b2b1373565975c7cfaf4e1217c5d24bbd26ebab6f9186c6c5cd26ad1b004b4f6d329f4e1ed2e5ee2bbf60d99ce4ef8ee4726699580c45c31ddff227821b'\n```\n\nThe signature hex is what we'll use below. Everything else is in the standard form, i.e.:\n\n```\ndefmodule EOSClient.KeyTool do\n  use Bitwise\n\n  def address_match?(eos_pub, msg, signature_hex) do\n    {:ok, recovered_pub} = recover_eos_pub(msg, signature_hex)\n    eos_pub == recovered_pub\n  end\n\n  def recover_eos_pub(msg, eos_signature) do\n    msg_hash = :crypto.hash(:sha256, msg)\n\n    # Here R, S are the same as ETH. V for EOS is found at the beginning of the\n    # hash\n    {r, s, v} = destructure_sig(eos_signature)\n    signature = BitHelper.pad(:binary.encode_unsigned(r), 32) <> BitHelper.pad(:binary.encode_unsigned(s), 32)\n\n    # Calculate i\n    # https://github.com/EOSIO/eosjs-ecc/blob/master/src/signature.js#L109\n    i = (v - 27) &&& 3\n    IO.inspect [\"i\", i]\n\n    case :libsecp256k1.ecdsa_recover_compact(msg_hash, signature, :compressed, i) do\n      {:ok, pub} ->\n        {:ok, Base.encode16(pub, case: :lower)\n              |> pub_hex_to_eos}\n      {:error, err} ->\n        {:error, err}\n    end\n  end\n\n  def destructure_sig(sig) do\n    {\n      String.slice(sig, 2, 64)\n      |> EthClient.Hex.decode_hex\n      |> :binary.decode_unsigned,\n      String.slice(sig, 66,64)\n      |> EthClient.Hex.decode_hex\n      |> :binary.decode_unsigned,\n      String.slice(sig, 0, 2)\n      |> EthClient.Hex.decode_hex\n      |> :binary.decode_unsigned\n    }\n  end\n\n  def eth_to_eos_sig(eth_hex) do\n    {sig, pad} =\n      eth_hex\n      |> String.slice(2..-1)\n      |> String.split_at(-2)\n\n    {int, _} = Integer.parse(pad, 16)\n\n    prefix = Integer.to_string(int + 4, 16)\n    raw_sig = prefix <> sig\n    \"SIG_K1_\" <> check_encode(raw_sig, \"K1\")\n  end\n\n  def pub_hex_to_eos(pubkey, key_type \\\\ nil) do\n    IO.inspect pubkey\n    pub_bin = pubkey\n              |> Base.decode16!(case: :lower)\n\n\n    check = case key_type do\n      nil -> [pub_bin]\n      key -> [pub_bin, key]\n    end\n\n    check_bin =\n      check\n      |> :erlang.iolist_to_binary\n\n    checksum =\n        hash(check_bin, :ripemd160)\n        |> :binary.part(0, 4)\n\n    \"EOS\" <> EthClient.Base58.encode(pub_bin <> checksum)\n  end\n\n\n  def check_encode(key, key_type \\\\ nil) do\n    bin = key\n          |> Base.decode16!(case: :lower)\n\n    check = case key_type do\n      nil -> [bin]\n      key -> [bin, key]\n    end\n\n    check_bin =\n      check\n      |> :erlang.iolist_to_binary\n\n    checksum =\n        hash(check_bin, :ripemd160)\n        |> :binary.part(0, 4)\n\n    EthClient.Base58.encode(bin <> checksum)\n  end\n\n  def hash(data, algorithm) do\n    :crypto.hash(algorithm, data)\n  end\n\nend\n```\n\nThere's some helpers along with this that I had written before for Ethereum sig validation. Since it's the same encryption under the hood, those work here as well. (Yes I should rename these).\n\nHex helper\n```\ndefmodule EthClient.Hex do\n  @moduledoc \"\"\"\n  Helpers for Compound to encode and decode to Ethereum's\n  hex format.\n  \"\"\"\n\n  require Integer\n\n  @spec encode_hex(binary()) :: String.t\n  def encode_hex(hex), do: \"0x\" <> Base.encode16(hex, case: :lower) # TODO: This should be shorten for odd length strings?\n\n  @spec decode_hex(String.t) :: binary()\n  def decode_hex(\"0x\" <> hex_data), do: decode_hex(hex_data)\n  def decode_hex(hex_data) when Integer.is_odd(byte_size(hex_data)), do: decode_hex(\"0\" <> hex_data)\n  def decode_hex(hex_data) do\n    Base.decode16!(hex_data, case: :mixed)\n  end\n\n  @spec maybe_decode_hex(String.t | nil) :: binary() | nil\n  def maybe_decode_hex(nil), do: nil\n  def maybe_decode_hex(hex), do: decode_hex(hex)\n\n  @spec maybe_decode_hex_int(String.t | nil) :: integer() | nil\n  def maybe_decode_hex_int(hex) do\n    case maybe_decode_hex(hex) do\n      nil -> nil\n      bin -> :binary.decode_unsigned(bin)\n    end\n  end\nend\n```\nBase58 helper:\n```\ndefmodule EthClient.Base58 do\n  @alphabet '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'\n\n  def encode(data, hash \\\\ \"\")\n\n  def encode(data, hash) when is_binary(data) do\n    encode_zeros(data) <> encode(:binary.decode_unsigned(data), hash)\n  end\n\n  def encode(0, hash), do: hash\n\n  def encode(data, hash) do\n    character = <<Enum.at(@alphabet, rem(data, 58))>>\n    encode(div(data, 58), character <> hash)\n  end\n\n  defp encode_zeros(data) do\n    <<Enum.at(@alphabet, 0)>>\n    |> String.duplicate(leading_zeros(data))\n  end\n\n  defp leading_zeros(data) do\n    :binary.bin_to_list(data)\n    |> Enum.find_index(&(&1 != 0))\n  end\nend\n```\n\nMost of the steps to get here have been derived from reading some excellent blog posts on Bitcoin, and reading through some elixir crypto libraries that deal with either bitcoin or ethereum. I've just managed to glue them together to apply them to EOSIO. 🚀\n\nSome of the posts and/or repos that are helpful (and many more that I lost the chrome tab to):\nhttps://blog.lelonek.me/how-to-calculate-bitcoin-address-in-elixir-68939af4f0e9\nhttps://github.com/KamilLelonek/ex_wallet\nhttp://www.petecorey.com/blog/2018/01/08/bitcoins-base58check-in-pure-elixir/\nhttps://github.com/exthereum/exth_crypto/blob/master/lib/signature/signature.ex\n\nUntil next time!\n\nAngel\n[twitter](https://twitter.com/ajose01)\n[sense.chat](https://my.sense.chat/amazingangel)",
      "title": "EOS Signature verification with Elixir 😍",
      "author": "ajose01",
      "permlink": "4qpcsr-eos-signature-verification-with-elixir",
      "json_metadata": "{\"tags\":[\"eosio\",\"elixir\",\"ecdsa\",\"ecc\",\"libsecp256k1\"],\"image\":[\"https://cdn.steemitimages.com/DQmX3cUD6T2ZEQDfPLzFVBf9hbMr8EvWoMTGjKRzFbPvFwX/kelly-sikkema-1485308-unsplash.jpg\"],\"links\":[\"https://github.com/EOSIO/eosjs-ecc\",\"https://blog.lelonek.me/how-to-calculate-bitcoin-address-in-elixir-68939af4f0e9\",\"https://github.com/KamilLelonek/ex_wallet\",\"http://www.petecorey.com/blog/2018/01/08/bitcoins-base58check-in-pure-elixir/\",\"https://github.com/exthereum/exth_crypto/blob/master/lib/signature/signature.ex\",\"https://twitter.com/ajose01\",\"https://my.sense.chat/amazingangel\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}",
      "parent_author": "",
      "parent_permlink": "eosio"
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{
  "op": [
    "comment",
    {
      "body": "# EOS Signature Verification and ECDSA Tooling with Elixir\n\n![kelly-sikkema-1485308-unsplash.jpg](https://cdn.steemitimages.com/DQmX3cUD6T2ZEQDfPLzFVBf9hbMr8EvWoMTGjKRzFbPvFwX/kelly-sikkema-1485308-unsplash.jpg)\nPhoto by Kelly Sikkema on Unsplash\n\n\nElixir is one of my favorite programming languages. It's a wonderful backend languages and it really lends itself to glueing many of the backend processes that support synchronizing blockchain world to current infrastructures. A recent task I worked on requires verifying using an EOS signature to prove a request on our services. After plenty google-fu and reading through the [eosjs-ecc](https://github.com/EOSIO/eosjs-ecc) library here's what I came up with:\n\nFirst, to simplify things for the elixir side we'll grab the EOS signature in hex format vs. the standard `SIG_K1_` format. Doing so isn't too difficult with `eosjs-ecc`:\n```\nconst sig = ecc.Signature.sign('helloworld', privateKey).toHex();\n// or if you already have a signature\nconst sig = ecc.Signature.fromString('SIG_K1_....');\nsig.toHex();\n//sample hex:\n//'1f529f1b2b1373565975c7cfaf4e1217c5d24bbd26ebab6f9186c6c5cd26ad1b004b4f6d329f4e1ed2e5ee2bbf60d99ce4ef8ee4726699580c45c31ddff227821b'\n```\n\nThe signature hex is what we'll use below. Everything else is in the standard form, i.e.:\n\n```\ndefmodule EOSClient.KeyTool do\n  use Bitwise\n\n  def address_match?(eos_pub, msg, signature_hex) do\n    {:ok, recovered_pub} = recover_eos_pub(msg, signature_hex)\n    eos_pub == recovered_pub\n  end\n\n  def recover_eos_pub(msg, eos_signature) do\n    msg_hash = :crypto.hash(:sha256, msg)\n\n    # Here R, S are the same as ETH. V for EOS is found at the beginning of the\n    # hash\n    {r, s, v} = destructure_sig(eos_signature)\n    signature = BitHelper.pad(:binary.encode_unsigned(r), 32) <> BitHelper.pad(:binary.encode_unsigned(s), 32)\n\n    # Calculate i\n    # https://github.com/EOSIO/eosjs-ecc/blob/master/src/signature.js#L109\n    i = (v - 27) &&& 3\n    IO.inspect [\"i\", i]\n\n    case :libsecp256k1.ecdsa_recover_compact(msg_hash, signature, :compressed, i) do\n      {:ok, pub} ->\n        {:ok, Base.encode16(pub, case: :lower)\n              |> pub_hex_to_eos}\n      {:error, err} ->\n        {:error, err}\n    end\n  end\n\n  def destructure_sig(sig) do\n    {\n      String.slice(sig, 2, 64)\n      |> EthClient.Hex.decode_hex\n      |> :binary.decode_unsigned,\n      String.slice(sig, 66,64)\n      |> EthClient.Hex.decode_hex\n      |> :binary.decode_unsigned,\n      String.slice(sig, 0, 2)\n      |> EthClient.Hex.decode_hex\n      |> :binary.decode_unsigned\n    }\n  end\n\n  def eth_to_eos_sig(eth_hex) do\n    {sig, pad} =\n      eth_hex\n      |> String.slice(2..-1)\n      |> String.split_at(-2)\n\n    {int, _} = Integer.parse(pad, 16)\n\n    prefix = Integer.to_string(int + 4, 16)\n    raw_sig = prefix <> sig\n    \"SIG_K1_\" <> check_encode(raw_sig, \"K1\")\n  end\n\n  def pub_hex_to_eos(pubkey, key_type \\\\ nil) do\n    IO.inspect pubkey\n    pub_bin = pubkey\n              |> Base.decode16!(case: :lower)\n\n\n    check = case key_type do\n      nil -> [pub_bin]\n      key -> [pub_bin, key]\n    end\n\n    check_bin =\n      check\n      |> :erlang.iolist_to_binary\n\n    checksum =\n        hash(check_bin, :ripemd160)\n        |> :binary.part(0, 4)\n\n    \"EOS\" <> EthClient.Base58.encode(pub_bin <> checksum)\n  end\n\n\n  def check_encode(key, key_type \\\\ nil) do\n    bin = key\n          |> Base.decode16!(case: :lower)\n\n    check = case key_type do\n      nil -> [bin]\n      key -> [bin, key]\n    end\n\n    check_bin =\n      check\n      |> :erlang.iolist_to_binary\n\n    checksum =\n        hash(check_bin, :ripemd160)\n        |> :binary.part(0, 4)\n\n    EthClient.Base58.encode(bin <> checksum)\n  end\n\n  def hash(data, algorithm) do\n    :crypto.hash(algorithm, data)\n  end\n\nend\n```\n\nThere's some helpers along with this that I had written before for Ethereum sig validation. Since it's the same encryption under the hood, those work here as well. (Yes I should rename these).\n\nHex helper\n```\ndefmodule EthClient.Hex do\n  @moduledoc \"\"\"\n  Helpers for Compound to encode and decode to Ethereum's\n  hex format.\n  \"\"\"\n\n  require Integer\n\n  @spec encode_hex(binary()) :: String.t\n  def encode_hex(hex), do: \"0x\" <> Base.encode16(hex, case: :lower) # TODO: This should be shorten for odd length strings?\n\n  @spec decode_hex(String.t) :: binary()\n  def decode_hex(\"0x\" <> hex_data), do: decode_hex(hex_data)\n  def decode_hex(hex_data) when Integer.is_odd(byte_size(hex_data)), do: decode_hex(\"0\" <> hex_data)\n  def decode_hex(hex_data) do\n    Base.decode16!(hex_data, case: :mixed)\n  end\n\n  @spec maybe_decode_hex(String.t | nil) :: binary() | nil\n  def maybe_decode_hex(nil), do: nil\n  def maybe_decode_hex(hex), do: decode_hex(hex)\n\n  @spec maybe_decode_hex_int(String.t | nil) :: integer() | nil\n  def maybe_decode_hex_int(hex) do\n    case maybe_decode_hex(hex) do\n      nil -> nil\n      bin -> :binary.decode_unsigned(bin)\n    end\n  end\nend\n```\nBase58 helper:\n```\ndefmodule EthClient.Base58 do\n  @alphabet '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'\n\n  def encode(data, hash \\\\ \"\")\n\n  def encode(data, hash) when is_binary(data) do\n    encode_zeros(data) <> encode(:binary.decode_unsigned(data), hash)\n  end\n\n  def encode(0, hash), do: hash\n\n  def encode(data, hash) do\n    character = <<Enum.at(@alphabet, rem(data, 58))>>\n    encode(div(data, 58), character <> hash)\n  end\n\n  defp encode_zeros(data) do\n    <<Enum.at(@alphabet, 0)>>\n    |> String.duplicate(leading_zeros(data))\n  end\n\n  defp leading_zeros(data) do\n    :binary.bin_to_list(data)\n    |> Enum.find_index(&(&1 != 0))\n  end\nend\n```\n\nMost of the steps to get here have been derived from reading some excellent blog posts on Bitcoin, and reading through some elixir crypto libraries that deal with either bitcoin or ethereum. I've just managed to glue them together to apply them to EOSIO. 🚀\n\nSome of the posts and/or repos that are helpful (and many more that I lost the chrome tab to):\nhttps://blog.lelonek.me/how-to-calculate-bitcoin-address-in-elixir-68939af4f0e9\nhttps://github.com/KamilLelonek/ex_wallet\nhttp://www.petecorey.com/blog/2018/01/08/bitcoins-base58check-in-pure-elixir/\nhttps://github.com/exthereum/exth_crypto/blob/master/lib/signature/signature.ex\n\nUntil next time!\n\nAngel\n[twitter](https://twitter.com/ajose01)\n[sense.chat](https://my.sense.chat/amazingangel)",
      "title": "EOS Signature verification with Elixir 😍",
      "author": "ajose01",
      "permlink": "eos-signature-verification-with-elixir",
      "json_metadata": "{\"tags\":[\"elixir\",\"eosio\",\"ecdsa\",\"ecc\",\"libsecp256k1\"],\"image\":[\"https://cdn.steemitimages.com/DQmX3cUD6T2ZEQDfPLzFVBf9hbMr8EvWoMTGjKRzFbPvFwX/kelly-sikkema-1485308-unsplash.jpg\"],\"links\":[\"https://github.com/EOSIO/eosjs-ecc\",\"https://blog.lelonek.me/how-to-calculate-bitcoin-address-in-elixir-68939af4f0e9\",\"https://github.com/KamilLelonek/ex_wallet\",\"http://www.petecorey.com/blog/2018/01/08/bitcoins-base58check-in-pure-elixir/\",\"https://github.com/exthereum/exth_crypto/blob/master/lib/signature/signature.ex\",\"https://twitter.com/ajose01\",\"https://my.sense.chat/amazingangel\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}",
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      "body": "![Locks](https://cdn.steemitimages.com/DQmYb1GYUm6iRAksGi3acW36fVwfs6GQahioZjoMMSmuME3/image.png)\n[Photo - @neonbrand via unsplash](https://unsplash.com/@neonbrand)\n\n# Securing messages using EOS (and ECDH and AES)\n\n_Disclaimer: I'm sharing as I'm learning... please use at your own risk, or better yet share in comments how to improve! Also, I will use terms as seed / password loosely, to illustrate the process._\n\nCan we encrypt communication between two EOS users using the private / public keys already in our possession? YES! Well... with some caveats. ECC in itself is not an encryption algorithm. In EOS and other blockchains it is used to sign transactions, but not to obscure what is being signed. However, it can be leveraged to encrypt communications if we take a couple steps.\n\n## Preface\nWe are going to do this first the long way, to learn a bit about the process. We'll finish with a simpler (and quicker) way using some existing EOS tooling (Skip to Step 5 if you want to just see that). This is in Javascript, so here's what we'll need:\n```Javascript\nconst EC = require('elliptic').ec;\nconst hkdf = require('futoin-hkdf');\nconst aesjs = require('aes-js');\nconst ecc = require('eosjs-ecc');\n```\nWe'll also generate some EOS keys for ourselves:\n```Javascript\nlet eosPk1 = await PrivateKey.randomKey();\nlet eosPk2 = await PrivateKey.randomKey()\nlet eosPub1 = ecc.privateToPublic(eosPk1);\nlet eosPub2 = ecc.privateToPublic(eosPk2);\nconsole.log(\"EOS USER 1: \", eosPub1);\nconsole.log(\"EOS USER 2: \", eosPub2);\n```\n\n## Step 1 - Generate a shared encryption seed.\n\nIn order to encrypt our communications, we would usually need an encryption seed (for us encryption noobs, think something like a password) that we use to secure our communication. As long as both parties know the password, we can decrypt our message. The trick is having a common seed / pass that we never have to communicate to the other party. In crypto world, we already have enough keys to worry about! How can we accomplish this?\n\nEnter [ECDH](https://en.wikipedia.org/wiki/Elliptic-curve_Diffie%E2%80%93Hellman). Using this protocol, we can use our EOS (or any ECC) private key and the other parties EOS public key.\n\nHere's the process assuming we are EOS user 1:\n```Javascript\n// EOS KEY1 - Generating shared key\nconsole.log(\"Scenario 1. EOS User 1 generating shared key via own PK, and User 2 public key\\n\")\nconst key1 = ec.keyFromPrivate(eosPk1.toBuffer());\n// We simulate not knowing the other parties PK.\nlet eosPubBuffer2 = ecc.PublicKey(eosPub2).toBuffer();\nconst ecpub2 = ec.keyFromPublic(eosPubBuffer2);\nconst pub2 = ecpub2.getPublic();\nconsole.log(\"PubKey2: \", pub2);\nconst shared1 = key1.derive(pub2).toString(16);\nconsole.log(\"Shared key derived by EOS USER 1: \", shared1);\n```\nWe'd do the reverse for the other user, and we would end up generating the same shared key #winning.\n\n## Step 2 - Convert our shared key to a valid AES key / encryption seed.\n\nOur shared key here needs to be converted to a seed we can use with AES. To do that we use a Key Derivation Function, in this case [HKDF](https://en.wikipedia.org/wiki/HKDF).\n\n```Javascript\n// Convert shared key to AES valid key\nlet key = hkdf(shared1, 16)\n```\n\n## Step 3 - Encrypt our message via AES\n\nNow that we have a valid key to use for AES encryption, we can finally get to making our messages secret.\n```Javascript\nlet text = \"Let's encrypt... secret taco meetup!\"\nconsole.log(\"Test string: \", text)\nlet textBytes = aesjs.utils.utf8.toBytes(text);\nlet aesCtr = new aesjs.ModeOfOperation.ctr(key);\nlet encryptedBytes = aesCtr.encrypt(textBytes);\n// We convert to hex to make it easy to transmit as text\nlet encryptedHex = aesjs.utils.hex.fromBytes(encryptedBytes);\nconsole.log(\"Encrypted text as it would be transmitted:\\n\", encryptedHex);\n// Encrypted text as it would be transmitted:\n// 9c27303372372cda33c70441f0960fde77fff9b118ddc64f2bcf027f3823da142f5e6baa\n\n```\nHere we could have used a nonce or a counter to add a bit more security to the messages we are sending or receiving.\n```Javascript\n// The counter is optional, and if omitted will begin at 1\nlet aesCtr = new aesjs.ModeOfOperation.ctr(key, new aesjs.Counter(5));\n```\n\n## Step 4 - Decrypting message\n\nThe other user would have been able to generate the same shared key using the steps above. On receiving this message, they would now use that key to decrypt the message.\n```Javascript\n// Time to decrypt\nconsole.log(\"Now going to decrypt...:\\n\", encryptedHex);\n\nlet encryptedBytes2 = aesjs.utils.hex.toBytes(encryptedHex);\n// Use same shared key to decrypt\nlet aesCtr2 = new aesjs.ModeOfOperation.ctr(key);\nlet decryptedBytes = aesCtr2.decrypt(encryptedBytes2);\nlet decryptedText = aesjs.utils.utf8.fromBytes(decryptedBytes);\nconsole.log(\"Decrypted text result: \", decryptedText);\n//Now going to decrypt...:\n// 9c27303372372cda33c70441f0960fde77fff9b118ddc64f2bcf027f3823da142f5e6baa\n//Decrypted text result:  Let's encrypt... secret taco meetup!\n```\nWooohooo! We have communicated without letting prying eyes know what we wrote. 🌮🌮🌮\n\nThe full code to test this out is [here](https://github.com/ajose01/eos_ecdh/blob/master/eosEncrypt.js). Feel free to give it a try.\n\n## Step 5 - EOS tooling makes it (somewhat) simpler.\nGoing through the steps above was a good exercise for me to learn how things are working under the hood, especially because I am interested in learning more about cryptography. However, there is a [simpler way](https://github.com/EOSIO/eosjs-ecc/issues/19) to do this via `eosjs-ecc`. Let's give it a whirl:\n\n###### First we encrypt using the same keys generated earlier.\n```Javascript\n// Message\nlet message = \"Tacos via EOS\";\nconsole.log(\"Message to encrypt: \", message);\n\n// EOS KEY1 - Encrypting\nconsole.log(\"EOS User 1 encrypting the message\\n\")\nlet encryptedMessage = ecc.Aes.encrypt(eosPk1, eosPub2, message)\nlet nonce = encryptedMessage.nonce.toString();\nlet checksum = encryptedMessage.checksum;\nlet messageHex = encryptedMessage.message.toString('hex');\nconsole.log(\"Items to send to user 2:\\n\", messageHex,nonce,checksum);\n// Items to send to user 2:\n// 28e2fa0c4bc8a339a5b7e096883e51fa 101379311011030238 1143290642\n```\nYou'll notice that we will have to send over some additional items with the user aside from the message: nonce and checksum.\n###### Now we can decrypt with the other user.\n```Javascript\n// EOS KEY2 - Decrypting the message\nconsole.log(\"EOS User 2 decrypting the message\\n\");\nlet messageBuffer = Buffer.from(messageHex, 'hex');\nlet decryptedMessageBuffer = ecc.Aes.decrypt(eosPk2, eosPub1, nonce, messageBuffer, checksum);\nlet decryptedMessage = decryptedMessageBuffer.toString();\nconsole.log(\"decrypted message: \", decryptedMessage);\nconsole.log(\"message match?: \", (message == decryptedMessage));\n//decrypted message:  Tacos via EOS\n//message match?:  true\n```\nThis takes care of generating the shared keys under the hood, so it let's us write less code. You can see or download the code [here](https://github.com/ajose01/eos_ecdh/blob/master/eosOnlyEncrypt.js).\n\n## Conclusion\nLearning the tools that are already available is super valuable. It opens up different options on dapp design, encryption and communications. I hope this was post was helpful 🙏\n\nAngel Jose / @ajose01 - I poke at the blockchain with the [Sense team](https://makesense.com/), host [EOS meetups](https://www.meetup.com/EOS-Dapp-Development-Meetup/), learn and share about crypto and eat 🌮🌮.\n* [sense.chat](https://sense.chat)\n* [steemit](https://steemit.com/@ajose01/)\n* [twitter](https://twitter.com/ajose01)\n* [youtube](https://www.youtube.com/channel/UC3TaA9_obCreXZrhECmKs2Q)\n* [past meetups](https://www.youtube.com/channel/UCN2TfO4zmz1PaezhBMtZXrw/videos)\n* [github](https://github.com/ajose01)",
      "title": "Securing messages using EOS (and ECDH and AES)",
      "author": "ajose01",
      "permlink": "securing-messages-using-eos-and-ecdh-and-aes",
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      "body": "@@ -75,10 +75,4 @@\n 4k90\n-&t=27s\n",
      "title": "",
      "author": "cryptolions",
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      "body": "This video tutorial may help too:  https://www.youtube.com/watch?v=6Yf-cHg4k90&t=27s",
      "title": "",
      "author": "cryptolions",
      "permlink": "re-ajose01-scatter-and-the-jungle-testnet-20181204t100326492z",
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      "body": "\"Step 2: You'll need to create an account and create an identity. Easiest way is to click on \"Play Around\"\"\n\nin Scatter? there's no such button or link there.  I've created an account on EOS via zeos and I can create an identity in Scatter but how do I bind the two together?",
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      "body": "Hello ajose01,\n   After scatter.getIndentity, does it returns the imported public key from the created identity in scatter or something else ?",
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