Cryptography Cryptic Crossword

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Across
  1. 4. BARNY, I'm all over the place' (6)
  2. 5. Two Greeks, deserted by a... (8)
  3. 7. He came, he saw, he ciphered. (6)
Down
  1. 1. Head-turning, whichever way you look at it (7)
  2. 2. You might say a number made with Rice Krispies, or Weetabix (6)
  3. 3. Secret code, or newspaper writer (6)
  4. 4. Data, or snacks? (5)
  5. 6. ANTIPROTONS IS - a cocktail of _____ (13)